I, for one, have some fraction of my net worth hedged on this possibility.

I expect that PM's would serve a similar function and be more reliable, but the proliferation of body scanners, divisibility issues and such render PMs a less flexible form in some scenarios.

I figure I have another 40-ish years left and suspect that it is more likely than not that we will experience a global financial disaster sometime within that time frame.  Or at least one in my country.  I guess I would reserve the term 'disaster' for something which would be unexpected.  In my mind, what I am expecting is more of an 'expected reset event' which is baked into the cake for all debt based monetary systems.